DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Roc \Roc\, n. [Ar. & Per. rokh or rukh. Cf. Rook a castle.]
      A monstrous bird of Arabian mythology. [Written also rock,
      and rukh.] --Brande & C.
      [1913 Webster]